Wheeler was diagnosed with thoracic outlet syndrome and will require additional surgery that’s expected to sideline him for six to eight months, the team announced Saturday.

Zack Wheeler's season is over. The Phillies announced on Saturday afternoon that their ace was diagnosed with venous thoracic outlet syndrome (TOS) and will undergo thoracic outlet decompression surgery in the coming weeks.

Philadelphia Phillies right-handed pitcher Zack Wheeler has been diagnosed with venous thoracic outlet syndrome and will undergo surgery in the coming weeks, the team announced today.